- Well i have a 1jz on stock twins, they were boosting fine, upgraded to single t61, then decided to sell them and put the stock twins back on i got them on, and on my first test drive i had no boost, i heard a loud whine, like a boost leak, so i re made the fmic piping checked all couplers, and still the same, i also noticed alot of white smoke when it warms up, could it be my twins are blown?? They were fine when i took them off they sat for about 3 months. My thing is they boosted all of a sudden for 3 quick pulls i did, randomly, then all of a sudden no boost at all. The noise sounds just like a boost leak any ideas??